/*!
 * hoverIntent r7 // 2013.03.11 // jQuery 1.9.1+
 * http://cherne.net/brian/resources/jquery.hoverIntent.html
 *
 * You may use hoverIntent under the terms of the MIT license. Basically that
 * means you are free to use hoverIntent as long as this header is left intact.
 * Copyright 2007, 2013 Brian Cherne
 */

/* hoverIntent is similar to jQuery's built-in "hover" method except that
 * instead of firing the handlerIn function immediately, hoverIntent checks
 * to see if the user's mouse has slowed down (beneath the sensitivity
 * threshold) before firing the event. The handlerOut function is only
 * called after a matching handlerIn.
 *
 * // basic usage ... just like .hover()
 * .hoverIntent( handlerIn, handlerOut )
 * .hoverIntent( handlerInOut )
 *
 * // basic usage ... with event delegation!
 * .hoverIntent( handlerIn, handlerOut, selector )
 * .hoverIntent( handlerInOut, selector )
 *
 * // using a basic configuration object
 * .hoverIntent( config )
 *
 * @param  handlerIn   function OR configuration object
 * @param  handlerOut  function OR selector for delegation OR undefined
 * @param  selector    selector OR undefined
 * @author Brian Cherne <brian(at)cherne(dot)net>
 */
var $ = require("jquery");
$.fn.hoverIntent = function(handlerIn, handlerOut, selector) {

    // default configuration values
    var cfg = {
        interval: 100,
        sensitivity: 7,
        timeout: 0
    };

    if (typeof handlerIn === "object") {
        cfg = $.extend(cfg, handlerIn);
    } else if ($.isFunction(handlerOut)) {
        cfg = $.extend(cfg, {
            over: handlerIn,
            out: handlerOut,
            selector: selector
        });
    } else {
        cfg = $.extend(cfg, {
            over: handlerIn,
            out: handlerIn,
            selector: handlerOut
        });
    }

    // instantiate variables
    // cX, cY = current X and Y position of mouse, updated by mousemove event
    // pX, pY = previous X and Y position of mouse, set by mouseover and polling interval
    var cX, cY, pX, pY;

    // A private function for getting mouse position
    var track = function(ev) {
        cX = ev.pageX;
        cY = ev.pageY;
    };

    // A private function for comparing current and previous mouse position
    var compare = function(ev, ob) {
        ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
        // compare mouse positions to see if they've crossed the threshold
        if ((Math.abs(pX - cX) + Math.abs(pY - cY)) < cfg.sensitivity) {
            $(ob).off("mousemove.hoverIntent", track);
            // set hoverIntent state to true (so mouseOut can be called)
            ob.hoverIntent_s = 1;
            return cfg.over.apply(ob, [ev]);
        } else {
            // set previous coordinates for next time
            pX = cX;
            pY = cY;
            // use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs)
            ob.hoverIntent_t = setTimeout(function() {
                compare(ev, ob);
            }, cfg.interval);
        }
    };

    // A private function for delaying the mouseOut function
    var delay = function(ev, ob) {
        ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
        ob.hoverIntent_s = 0;
        return cfg.out.apply(ob, [ev]);
    };

    // A private function for handling mouse 'hovering'
    var handleHover = function(e) {
        // copy objects to be passed into t (required for event object to be passed in IE)
        var ev = $.extend({}, e);
        var ob = this;

        // cancel hoverIntent timer if it exists
        if (ob.hoverIntent_t) {
            ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
        }

        // if e.type == "mouseenter"
        if (e.type == "mouseenter") {
            // set "previous" X and Y position based on initial entry point
            pX = ev.pageX;
            pY = ev.pageY;
            // update "current" X and Y position based on mousemove
            $(ob).on("mousemove.hoverIntent", track);
            // start polling interval (self-calling timeout) to compare mouse coordinates over time
            if (ob.hoverIntent_s != 1) {
                ob.hoverIntent_t = setTimeout(function() {
                    compare(ev, ob);
                }, cfg.interval);
            }

            // else e.type == "mouseleave"
        } else {
            // unbind expensive mousemove event
            $(ob).off("mousemove.hoverIntent", track);
            // if hoverIntent state is true, then call the mouseOut function after the specified delay
            if (ob.hoverIntent_s == 1) {
                ob.hoverIntent_t = setTimeout(function() {
                    delay(ev, ob);
                }, cfg.timeout);
            }
        }
    };

    // listen for mouseenter and mouseleave
    return this.on({
        'mouseenter.hoverIntent': handleHover,
        'mouseleave.hoverIntent': handleHover
    }, cfg.selector);
};
exports.hoverIntent = function(selector, handlerIn, handlerOut, delegationSelector) {
    $(selector).hoverIntent(handlerIn, handlerOut, delegationSelector);
};
